Abstract
Crystals of a new aqueous rare-earth borate-(Nd0.925Na0.075)Nd[B9O15(OH)2]Cl0.85 · 2.65H2O, space group P2/n-are obtained under hydrothermal conditions. The crystal structure is determined by the heavy-atom method without preliminary knowledge of the chemical formula. The independent anionic radical is a new corrugated layer related to layer pentaborates. Layers related by centers of inversion form sheets. Nd and Cl atoms are located in the intersheet space and in the large voids of the sheet. One of the positions of both Nd and Cl atoms is isomorphously shared with Na atoms and H2O molecules, respectively. The new borate is characterized as a polyborate (megaborate) containing the {(4:3[2T + Δ] + 1[Δ])∞ + (5[3T + 2Δ])∞}∞∞ complex anionic radical. The topological variants of the completion of the layer by additional triangles and the connection of layers into a framework are considered. The relationship between the new borate and the earlier studied LaB5O8(OH)2 · 1.5H2O framework borate is revealed.
Published Version
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